Making mouse wheel work with pmw ScrolledCanvas widget

[dan.gass at gmail.com]

Hi,

I am using the pmw tkinter package and having trouble getting the
ScrolledCanvas widget to respond to the mouse wheel.  I am running
Windows XP.  I've Googled it and came up empty.  I believe it should be
possible because Idle's editor window supports scrolling with a mouse
wheel.

Thanks in advance,

Dan Gass